<template>
  <div class="component-upload-image">
    <el-upload
      multiple
      :action="baseUrl + uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      ref="imageUpload"
      :on-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: this.fileList.length >= this.limit }">
      <i class="el-icon-plus" v-if="isShowIcon"></i>

      <i class="self-icon-size" v-else>上传主题</i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传{{ showTip }}
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
      </template>
      的文件
    </div>

    <el-dialog :visible.sync="dialogVisible" title="预览" width="800" append-to-body>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from '@/utils/auth'
import { listByIds, delOss } from '@/api/system/oss'

export default {
  props: {
    // 是否显示文字
    isShowIcon: {
      type: Boolean,
      default: false,
    },
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ['png', 'jpg', 'jpeg'],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
    // 上传地址
    uploadImgUrl: {
      type: String,
      default: '/system/oss/upload', // 上传的图片服务器地址,
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: '',
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      // uploadImgUrl: process.env.VUE_APP_BASE_API + "/system/oss/upload", // 上传的图片服务器地址
      headers: {
        Authorization: 'Bearer ' + getToken(),
      },
      fileList: [],
    }
  },
  watch: {
    value: {
      async handler(val) {
        if (val) {
          // 首先将值转为数组
          let list
          if (Array.isArray(val)) {
            list = val
          } else {
            await listByIds(val).then((res) => {
              list = res.data
            })
          }
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            // 此处name使用ossId 防止删除出现重名
            item = { name: item.ossId, url: item.url, ossId: item.ossId }
            return item
          })
        } else {
          this.fileList = []
          return []
        }
      },
      deep: true,
      immediate: true,
    },
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize)
    },
  },
  methods: {
    setFileList(fileList) {
      this.fileList = []
      // console.log(fileList, "fileList");
      // console.log(fileList,'fileList');
      if (fileList && fileList[0].url) {
        this.fileList = fileList
      }
    },
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false
      if (this.fileType.length) {
        let fileExtension = ''
        if (file.name.lastIndexOf('.') > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true
          if (fileExtension && fileExtension.indexOf(type) > -1) return true
          return false
        })
      } else {
        isImg = file.type.indexOf('image') > -1
      }

      if (!isImg) {
        this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join('/')}图片格式文件!`)
        return false
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize
        if (!isLt) {
          this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} MB!`)
          return false
        }
      }
      this.$modal.loading('正在上传图片，请稍候...')
      this.number++
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`)
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      if (res.code === 200) {
        this.$emit('success', res.data)
        this.uploadList.push({
          name: res.data.fileName,
          url: res.data.url,
          ossId: res.data.ossId,
        })
        this.uploadedSuccessfully()
      } else {
        this.number--
        this.$modal.closeLoading()
        this.$modal.msgError(res.msg)
        this.$refs.imageUpload.handleRemove(file)
        this.uploadedSuccessfully()
      }
    },
    // 删除图片
    handleDelete(file) {
      const findex = this.fileList.map((f) => f.name).indexOf(file.name)
      if (findex > -1) {
        // let ossId = this.fileList[findex].ossId;
        // ossId && delOss(ossId);
        this.fileList.splice(findex, 1)
        this.$emit('input', this.listToString(this.fileList))
      }
      this.$emit('remove', file)

    },
    // 上传失败
    handleUploadError(res) {
      this.$modal.msgError('上传图片失败，请重试')
      this.$modal.closeLoading()
    },
    // 上传结束处理
    uploadedSuccessfully() {
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList)
        this.uploadList = []
        this.number = 0
        this.$emit('input', this.listToString(this.fileList))
        this.$modal.closeLoading()
      }
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url
      this.dialogVisible = true
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = ''
      separator = separator || ','
      for (let i in list) {
        if (list[i].ossId) {
          strs += list[i].ossId + separator
        }
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : ''
    },
  },
}
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}

// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}

.self-icon-size {
  font-size: 13px;
}
::v-deep .el-upload-list__item-thumbnail {
  object-fit: contain;
}
</style>
